Congratulations! You killed one. Now you have something to hang on your wall.
Don't rule out cap tube sizing yet. If you cut off too much cap tube, it could have overfed your evaporator. You may have too much oil in the system also. When the temperature drops in the greenhouse, your head pressure will follow. This narrows your dP across the compressor, allowing it to pump way more gas than usual. If there is too much oil in the system, it will act the same way as if it were overcharged: the extra oil will run right through the system after the accumulator (oil separator) is full.
Liquid anything is bad for the compressor, worse than starvation. Liquid in the compression chamber tends to break things violently. It breaks pistons, rods, and valves. It bends crankshafts and shaves bearings. OTOH, starvation tends to burn up motor windings. Since you have no data to consider the root cause of the failure, it may be a good idea to do an autopsy on the pot after it is removed. It could save the next one's life.
Now would be the perfect time to install control and monitoring hardware. If you aren't trying to babysit this rig, I highly recommend adding a handful of temperature sensors and some sort of data logger. Now would be a good time to install some fail-safe devices as well. High and low pressure limit switches are in all but the cheapest (window or mini-split) units sized over a ton of capacity. Even the cheapest ones have a high-temperature cutout on the compressor.
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